Chapter 17: Q6PE (page 629)
Air temperature in the Sahara Desert can reach (about ). What is the speed of sound in air at that temperature?
The wave’s speed is 364.6 m/s.
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(a) What is the intensity in watts per meter squared of a just barely audible \({\rm{200 Hz}}\) sound? (b) What is the intensity in watts per meter squared of a barely audible \({\rm{4000 Hz}}\) sound?
(a) Calculate the minimum frequency of ultrasound that will allow you to see details as small as 0.250mm in human tissue. (b) What is the effective depth to which this sound is effective as a diagnostic probe?
The frequencies to which the ear responds vary by a factor of \[{\rm{1}}{{\rm{0}}^{\rm{3}}}\]. Suppose the speedometer on your car measured speeds differing by the same factor of \[{\rm{1}}{{\rm{0}}^{\rm{3}}}\], and the greatest speed it reads is \[{\rm{90}}{\rm{.0}}\;{\rm{mi/h}}\]. What would be the slowest nonzero speed it could read?
Sound is more effectively transmitted into a stethoscope by direct contact than through the air, and it is further intensified by being concentrated on the smaller area of the eardrum. It is reasonable to assume that sound is transmitted into a stethoscope\(100\)times as effectively compared with transmission though the air. What, then, is the gain in decibels produced by a stethoscope that has a sound gathering area of\(15.0\;{\rm{c}}{{\rm{m}}^{\rm{2}}}\), and concentrates the sound onto two eardrums with a total area of\(0.900\;{\rm{c}}{{\rm{m}}^{\rm{2}}}\)with an efficiency of\(40.0\% \)?
(a) Ear trumpets were never very common, but they did aid people with hearing losses by gathering sound over a large area and concentrating it on the smaller area of the eardrum. What decibel increase does an ear trumpet produce if its sound gathering area is\(900\;{\rm{c}}{{\rm{m}}^{\rm{2}}}\)and the area of the eardrum is\(0.500\;{\rm{c}}{{\rm{m}}^{\rm{2}}}\), but the trumpet only has an efficiency of\(5.00\% \)in transmitting the sound to the eardrum? (b) Comment on the usefulness of the decibel increase found in part (a)
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